Return looking embarrassed about enjoyment (6)
I believe the answer is:
refund
'return' is the definition.
('refund' can be a synonym of 'return')
'looking embarrassed about enjoyment' is the wordplay.
'looking embarrassed' becomes 'red' (I've seen this before).
'about' is an insertion indicator.
'enjoyment' becomes 'fun' (I've seen this before**).
'red' going around 'fun' is 'REFUND'.
(Other definitions for refund that I've seen before include "Cash back" , "Money returned" , "Give back" , "money to be paid back" .)